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MP7226LP Folha de dados(PDF) 11 Page - Exar Corporation

Nome de Peças MP7226LP
Descrição Electrónicos  BiCMOS Fixed, Quad, Voltage Output, Single or Dual Supply 8-Bit Digital-to-Analog Converter
PDF  16 Pages
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Fabricante Electrônico  EXAR [Exar Corporation]
Página de início  http://www.exar.com
Logo EXAR - Exar Corporation

MP7226LP Folha de dados(HTML) 11 Page - Exar Corporation

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MP7226
11
Rev. 2.00
–
+
Figure 7. Digitally Programmable Offset Adjustment Circuits
DAC
Output
VOFFSET
VOUT
VOUT = Dn X VREF + VOFFSET
where Dn is the digital input code
and can vary 0 to 255
–
+
DAC
Output1
VOUT
VOUT = Dn1 X VREF + Dn2 X VREF
where Dn is the digital input code and
can vary 0 to 255
DAC
Output2
RR
R
R
RR
R
R
VREF
VDD
VOUT
–5 V or GND
AGND
DAC
–
+
Figure 8. Digitally Programmable
AC Reference Input Signal Circuit (DC Couple)
–
+
AC
Reference
Input
DAC
or DC Voltage
+15 V
VSS
Offsetting DAC Outputs
Figure 7. shows examples of offset circuits.
DAC offset effects
When using the device in single supply applications, and
minimum reference voltage, there is a possibility that the DAC
output will not change when the code is incremented from 0.
Once the DAC has reached the offset voltage of the output
buffer, the DAC output will begin to increment in a normal opera-
tion.
5V Operation
The MP7226 can be operated with a single power supply
(VDD = +5V ) or dual power supplies ( VDD = +5V and VSS =
–5V) . The reference voltage range is reduced along with Some
performance parameter degradation. However the DNL of each
DAC remains at
1 LSB guaranteeing monotonicity.



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